Yaesu Ft 23r Mk2 Op Manual

FT-23R MKⅡOPERATING MANUAL

YAESU MUSEN CO., LTD.1-20-2 Shimomaruko, Ota-Ku, Tokyo 146-8649, Japan

YAESU U.S.A.17210 Edwards Rd., Cerritos, CA 90703, U.S.A.

YAESU EUROPE B.V.Snipweg 3, 1118DN Schiphol, The Netherlands

YAESU UK LTD.Unit 12, Sun Valley Business Park, Winnall Trading EstateWinchester, Hampshire, SO23 0LB, U.K.

YAESU GERMANY GmbHAm Kronberger Hang 2, D-65824 Schwalbach, Germany

YAESU HK LTD.11th Floor Tsim Sha Tsui Centre, 66 Mody Rd.,Tsim Sha Tsui East, Kowloon, Hong Kong

ContentsSpecifications ..................................................................................................... 2

General .......................................................................................................... 2Receiver ........................................................................................................ 2Transmitter .................................................................................................... 2

Accessories & Options List ................................................................................ 3

Controls & Connections .................................................................................... 4Top Panel ...................................................................................................... 4Side Panel ...................................................................................................... 5Front Panel .................................................................................................... 6

Accessories......................................................................................................... 7Battery Packs, Battery Case & Chargers ......................................................... 7NC-29 5-hour Quick Charger ......................................................................... 7PA-6 Mobile DC Adapter/Charger for FNB-14 and FNB-17 ........................... 8Dry-Cell Battery Case .................................................................................... 8Battery Removal & Replacement .................................................................... 9MH-32A2B & MH-34C2B Speaker/Microphone............................................. 10Antenna Considerrations .............................................................................. 10

Operation ........................................................................................................ 11Preliminary Operating Information ............................................................... 11Squelch Setup .............................................................................................. 11Transmitting ................................................................................................ 12Frequency & Step Selection ......................................................................... 13Memory Storage & Recall ............................................................................ 14Repeater Operation ...................................................................................... 15Scanning ...................................................................................................... 16Priority Channel Monitoring ......................................................................... 17Tone Squelch Operation ............................................................................... 18

In Case of Problems ......................................................................................... 19

Getting the Most from Your Batteries ............................................................ 20

Memory Cloning ............................................................................................. 21

Installation of Option ...................................................................................... 22FTS-12 Tone Squelch Unit Installation ......................................................... 22

FT-23R MKII OPERATING MANUAL 1

Yaesu FT-23R MKⅡ2m Hand-Held

Cpu-Controlled FM TransceiverThe FT-23R MKⅡ is an ultra compact FM hand-held for the 2m amateur band that offersthe convenience of very small size and light weight combined with the features and flex-ibility of performance only possible with microprocessor control. A variety of recharge-able battery packs and dry cell cases are available, providing up to five watts of RF poweroutput.

The transceiver is housed entirely in zinc and aluminum die-cast alloys, and battery casesare constructed of thick high-impact polycarbonate plastic, for professional-grade rugged-ness required in the most demanding applications. Rubber gasket seals around all externalcontrols and connectors keep out dust and rain or spray, assuring years of reliable opera-tion even in harsh environments.

Standard microprocessor-controlled features included ten memory channels which eachstore repeater shifts, CTCSS (Continuous Tone Controlled Squelch System) tone frequen-cies and tone encode/decode selections*; busy channel and priority channel scanning; 1MHzup/down stepping; plus a top panel rotary dial for memory and frequency selection. Sevenof the memories can also be programmed for non-standard repeater shifts. The LCD (Liq-uid Crystal Display) shows six frequency digits, memory channel selection, and CTCSStone frequency during tone selection*, and includes a bargraph S/PO meter.

Please read this manual carefully to gain a clear understanding of the features of the FT-23R MKⅡ.

*: CTCSS tone features require the FTS-12 Tone Squelch Unit, optional in some countries.

FT-23R MKII OPERATING MANUAL2

Specifications

GeneralFrequency coverage (MHz): 144 to 147.9995 (versions A, C & E)

144 to 145.9875 (versions B & D)Channel steps: 5 & 10 kHz (vers. A/D/E) or 12.5 & 25 kHz (vers. B/C)Standard repeater shift: 600 kHzEmission type: G3ESupply voltage: 6.0 to 15.0 VDCCurrent consumption: 19 mA Stby (Save ON); 150 mA Rceive;

1500 mA Transmit (5W); 900 mA Transmit (2W)Antenna (BNC jack): YHA-16 rubber flex antennaCase size (WHD): 55 x 188 x 32mm w/FNB-11H

55 x 155 x 32mm w/FNB-12/-1455 x 133 x 32mm w/FNB-/FBA-17

Weight (approx): 430g w/FNB-17, 550g w/FNB-11H

ReceiverCircuit type: Double-conversion superheterodyneSensitivity: better than 0.25 µV for 12dB SINADAdjacent channel selectivity: better than 60dBIntermodulation: better than 65dBAudio output: 0.4W @8 W for 5% THD (with 12V supply)

TransmitterPower output: 5W @12V, 2.5W @7.2V or FBA-17Frequency stability: better than 10 ppmModulation system: variable reactanceMaximum deviation: ±5 kHzFM Noise: better than –40dB @ 1 kHzSpurious emissions: better than 60dB below carrierAudio distortion: less than 5% @ 1 kHz, w/3 kHz deviationMicrophone type: 2-kΩ condenserBurst tone: 1750 Hz (except version A)

Specifications may be subject to change without notice or obligation.


Accessories & Options ListFNB-11H 12V, 700mAh Ni-Cd Battery PackFNB-12 12V, 500mAh Ni-Cd Battery PackFNB-14 7.2V, 1000mAh Ni-Cd Battery PackFNB-17 7.2V, 600mAh Ni-Cd Battery PackFBA-17 Dry cell Battery Case for 6 AA-size cellsNC-34B 117 VAC Compact Wall Charger for FNB-14NC-34C 220-234 VAC Compact Wall Charger for FNB-14NC-65B 117 VAC Compact Wall Charger for FNBNC-65C 220-234 VAC Compact Wall Charger for FNBNC-65F 220 VAC w/Argentine plug Compact Wall Charger for FNBNC-65U 220-234 VAC w/UK plug Compact Wall Charger for FNBNC-29 Desktop Quick Charger for all above FNB packsNC-50 Dual-Slot Rapid ChargerCA-7 Charger Sleeve (required w/NC-50)PA-6 Mobile DC Adapter/Charger for 7.2 V packs (FNB-14/-17)MH-32A2B External Hand Speaker/MicrophoneMH-34C2B External Hand Speaker/MicrophoneMH-37B2B Earpiece/MicrophoneYHA-16 Rubber flex antennaFTS-12 CTCSS Subaudible Tone Squelch UnitMMB-32A Mobile Hanger Bracket

Availability of accessories may vary: some accessories are supplied asstandard per localregulations and requirements, others may be unavailable in some regions. Check withyour Yaesu dealer for additions to the above list.


Controls & Connectors

TOP PANEL

EAR JackThis 2-conductor mini phone jack providesaudio output for an external earphone or theoptional speaker/microphone, while disablingthe internal loudspeaker.

MIC JackThis 2-contact micro-mini phone jack acceptsmicrophone input from a speaker/microphone,or other external source, while disabling theinternal microphone.

LOW Power Output ButtonKeep this button depressed whenever low power is sufficient for communications.Low power is 200 to 500 mW, depending on battery voltage.

DIAL Rotary SelectorThis 20-position switch tunes the operating (or CTCSS tone) frequency or selectsmemory channels, according to the function selected by front panel keys. This knobduplicates the functions of the [p] and [q] keys for convenience.

VOL/OFF ContralThis control adjusts the volume of the receiver. Turn it fully counterclockwise (into theclick stop) position to turn the transceiver off.

SQL ControlThis knob sets the threshold level at which received signals (or noise) open the squelch.For prolonged battery life and squelch sensitivity, set this control just to the pointwhere noise is silenced (and the BUSY/TX indicator on the front panel is off) whenthe channel is clear.

ANTENNA JackThis BNC jack accepts the supplied YHA-16 rubber flex antenna, or any other an-tenna designed to provide 50-ohm impedance on the 2-meter band.



SIDE PANEL

Monitor (Burst) ButtonIn the US version, this button open the noise squelch mo-mentarily without disturbing the setting of the SQL con-trol. In the European version, this button activates the 1750-Hz burst tone generator when pressed together with the PTTbutton.

PTT ButtonPress and hold this (Push-to-Talk) button to transmit. TheBUSY/TX indicator glows red while transmitting.

Unlock LeverSlide this mechanical lever upward to release the batteryfor removal.


FRONT PANEL

BUSY/TX Indicator LampThis LED indicator glows green whenthe noise squelch is open during recep-tion, and red when transmitting.

KeypadThese eight keys select the various op-erating features of the transceiver dur-ing reception. A beep will sound when-ever one of the keys is pressed. The la-bels on the faces of the keys indicatetheir primary functions, while the labelsabove six of the keys indicate alternatefunctions, which are activated by press-ing the [F] key first, and then the otherkey within four seconds. In this manual,we will refer to these functions by thealternate label (above the key), prefixedby “[F] + ” to remind you to press [F]first. For example, “[F] + [q]” indicatesthat you should press the [F] key, fol-lowed by the [q] key within four sec-onds. All key functions aredescribed indetail in Operation chapter, and summa-rized on the “FT-23R MKII Operator’s Quick Reference Card.”

LCD (Liquid Crystal Display)The display shows the selected operating conditions as indicated in the following dia-gram:



Accessories

BATTERY PACKS, BATTERY CASE & CHARGERS

The FT-23R MKⅡ requires the FNB-11H or FNB-12 twelve-volt rechargeable Ni-Cd bat-tery pack for the full 5-watt power output. However, where slightly lower power output(2.5 watts) is practical, the dry-cell battery case and the FNB-14 and FNB-17 Ni-Cdpacks offer smaller size, lighter weight or extended battery charger life. Any of the Ni-Cdpacks may be recharged either while attached to the transceiver or separately. Each Ni-Cdpack should be fully charged before it is used with the transceiver for the first time.

Three types of chargers are available: 15-hour compact chargers, the NC-29 1-hour Desk-top Quick Charger and PA-6 Mobile Adapter/Charger.

A different compact charger is required for each model pack:Ni-Cd Pack Voltage Capacity Compact ChargerFNB-11H 12V 700 mAh NC-65FNB-12 12V 500 mAh NC-65FNB-14 7.2V 1000 mAh NC-34FNB-17 7.2V 600 mAh NC-65

Make certain that you use the correct compact charger for each pack. The NC-34 compactcharger is available with a “B” suffix for operation from 117-VAC mains, or with a “C”suffix for operation from 220 ~ 234VAC mains. The NC-65 compact charger is availablewith a “B” suffix for operation from 117-VAC mains, with a “C” suffix for operation from220 ~ 234VAC mains, with a “F” suffix for operation from 220VAC w/Argentine plugmains, or with a “U” suffix for operation from 220 ~ 234VAC w/UK plug mains.

NC-29 5-HOUR QUICK CHARGER

The NC-29 is a universal AC mains battery charger with quick and trickle charging modesfor all of the FNB series Ni-Cd packs listed above. It comes wired from the mains voltagein the area sold. The quick mode is automatically selected initially, to bring the batterypack up to full charge as fast as safely possible using an internal timer. Three LED indica-tors show elapsed charging time after 1, 3 and 5 hours. The charger then reverts to thetrickle mode (green indicator), to prevent self-discharge. The quick mode recharges a com-pletely discharged battery in about 5 hours, depending on temperature.

CAUTION !When using the NC-29, do not switch the charger off and on or remove and thenreplace a battery from the charger while it is charging, as this will reset the timerand may then overcharge the battery.


Accessories

PA-6 MOBILE DC ADAPTER/CHARGER

FOR FNB-14 AND FNB-17The PA-6 is a DC-DC adapter for use when operating the transceiver mobile, and forcharging the 7.2-volt FNB-14 and FNB-17 Ni-Cd battery packs. The PA-6 recharges acompletely discharged FNB-17 in about 15 hours, or trickle charges an FNB-14 (to fullcharge in about 35 hours). Be careful to avoid overcharging, as the PA-6 does not includea timer. The PA-6 cannot be used for charging the FNB-11H or FNB-12, as the chargingvoltage is too low. Use only with 12-volt negative-ground electrical systems.

DRY-CELL BATTERY CASE

The FBA-17 dry-cell battery case may be used with six “AA” (UM-3) batteries, but theseprovide only reduced power, and must not be with rechargeable cells (because they lackthe necessary safety circuits provided in the FNB series).

In some countries, one or more of above may be supplied with the transceiver. If you needa battery, contact your nearest Yaesu dealer to purchase the desired battery pack or case.We do not recommend the use of any other type of battery with the FT-23R MKⅡ, and usinganother type may affect your warranty.

CAUTION !Never allow the terminals of the battery pack or case to be short-circuited!


Accessories

BATTERY REMOVAL & REPLACEMENT

r Make sure that the VOL control is set into the OFF click-stop, and remove the protec-tive soft or hard case, if used.

r Grasp the transceiver with yourleft hand, so your palm is over thespeaker and your thumb is on theUNLOCK button.

r Move the UNLOCK button in thedirection indicated by the arrow-head, while using your right handto slide the battery case toward theside with the UNLOCK button.The battery case should slide smoothly out of its track.

To open the FBA-17 battery case, place both of your thumbs on the tracks on top of thecase and gently pry the tracks apart. Always replace all six batteries, paying attention to thepolarity indicated inside the case.

Do not attempt to open any of the rechargeable Ni-Cd packs.

To replace the battery case or Ni-Cd pack, repeat the second and third steps above, simplysliding the battery case in the other direction after aligning the shorter side of the batterycase with the track below the UNLOCK button.


Accessories

MH-32A2B & MH-34C2B SPEAKER/MICROPHONE

A Speaker/Mic can increase operating convenience and extend communications range.Each is equipped with a dual plug connector which mates with the EAR and MIC jacks onthe top panel of the transceiver, disabling the internal speaker and microphone. The speaker/mic cable allows the transceiver to be left clipped to your belt, or to be held overheadabove obstructions for improved performance. Also, using a speaker/mic for mobile op-eration allows the transceiver to be left in the MMB-32A Mobile Hanger.

Hold the Speaker/Mic close to your ear during reception; or if preferred, connect an exter-nal earphone to the plug on the Speaker/Mic, attenuating the audio from its loudspeaker.To transmit just hold the Speaker/Mic close to your mouth and close the PTT switch on themicrophone.

ANTENNA CONSIDERATIONS

While the supplied YHA-16 rubber flex antenna is convenient for short-range portableoperation, the standard BNC connector allows for use of a higher gain antenna to extendedrange in base or mobile operation. Any antenna used with the FT-23R MKⅡshould have animpedance close to 50 ohms on the 2m amateur band. If a feedline is used, it should begood quality 50-ohm coax. Obtaining a proper fit with some BNC plugs may require re-moving the rubber gasket around the antenna jack on the transceiver.


OperationThis chapter describes the various transceiver functions in detail. After studying thesedescriptions, keep the “FT-23R MKII Operator’s Quick Reference Card” handy in caseyou need to refresh your memory.

PRELIMINARY OPERATING INFORMATION

Before operating the transceiver for the first time;r Charge the battery pack completely (if using Ni-Cd batteries) as described on page 7.

If using an FBA-17 dry-cell battery case, install the batteries as described on page 9.r Connect the YHA-16 rubber flex antenna to the antenna jack on the top of the trans-

ceiver. Never operate the transceiver without an antenna connected.r We suggest you do not connect the Speaker/Mic, if you have one, until you are familiar

with basic operation.r Before proceeding, please read the “Control & Connectors” chapter, if you have not

already, to familiarize yourself with the functions of the controls.

When the front panel keys are pressed during reception, a beep will sound. If the keypadbeeper begins to sound continuously the battery pack should be recharged or batteriesreplaced.

If you have trouble getting the transceiver to work as described, see “In Case of Prob-lems”, on page 19.

SQUELCH SETUP

r Set the SQL control fully counterclockwise, rotate the VOL control out of the click-stop and adjust for a comfortable volume on the noise or received signal.

r The BUSY/TX indicator LED should glow green, indicating that the squelch is open.If a signal is present, rotate the DIAL selector on the top panel to a channel where onlynoise is heard.

r Adjust the SQL control just to the point where the noise is silenced and the LED isextinguished. (If the SQL control is set further clockwise, sensitivity to weak signalswill be reduced.)

Now, whenever a signal reaches the receiver that is strong enough to open the squelch, theBUSY/TX indicator will glow green.

Note that while receiving, one or more bargraph segments may appear along the bottom ofthe display, indicating signal strength of received signals. This indication is not affected bythe squelch setting, so even squelched signals will have some indication. If you noticemore than one or two bargraph segments appearing while the squelch is closed, try reduc-ing the squelch control setting (if you want to hear weak signals).

The Monitor switch on the USA versions (just above the PTT switch) allows you to check


Operation

for channel activity beneath the squelch level and to adjust the volume without having toadjust the squelch: just press the Monitor switch and the noise squelch will open (this doesnot open the tone squelch, however, if the FTS-12 Tone Squelch option is installed andactivated, as descried later).

The FT-23R MKⅡ includes an automatic power saver system, which reduces battery con-sumption by turning the receiver on (for 300 milliseconds) and off (for 600 milliseconds)when the channel is clear and the squelch is closed. The power saver will not affect voice-mode operation*, except to prolong the charge life of your batteries.

*: For Packet, the Power Saver should be disabled, Ask your Yaesu dealer for details.

TRANSMITTING

Press the LOW button to select low power output. When you wish to transmit, wait untilthe channel is clear (BUSY/TX LED off), and squeeze the PTT switch on the side of thetransceiver while speaking into the microphone (just below the keypad on the front panel).During transmission the BUSY/TX indicator will glow red, and the bargraph will nowshow relative transmitter power output. Release the PTT switch to receive.

If you find that more power is required, set the LOW button to the undepressed ( )position. However, we recommend that whenever communication is possible with lowpower, you should keep the LOW button depressed ( ) to both conserve battery life andminimize possible interference to other stations.

“Dial” and “Memory” modesThe FT-23R MKⅡ has two different operating status, referred to as the “Dial mode”and the “Memory mode”, which affect the functions of most of the controls. It isimportant to know which state is currently active when changing frequencies. Todetermine which state is active, look at the upper left corner of the display. Whenthe Memory mode is active, a Memory number appears. To switch operating states,press [D/MR] key.

SQUELCH SETUP


Operation

FREQUENCY & STEP SELECTION

To select a new operating frequency, the transceiver must be in the Dial mode (see box,above). If you see a Memory number, press the [D/MR] key to switch to Dial mode. Thereare two ways to select your operating frequency: by the DIAL selector on the top, or withthe [p] and [q] keys. For continuous tuning, press and hold the [p] or [q] key for morethan ½-second. One-Megahertz giant steps are also available: just press [F] + [p] or [F] +[q] (and hold the second key for repeated stepping), or press [F] and rotate the DIALselector.

Channel steps are 5 or 10 kHz in versions A, D and E, and 12.5 or 25 kHz in versions B andC. To change from one step size to the other for your version, press [F] + [STEP]*. In the12.5/25 kHz versions a small .5-kHz digit is displayed at the right end of the frequency.

*: If nothing happens when you press a key, see if there is a small “L” at the lower leftcorner of the display. If so, press [F] + [LOCK] to unlock the keys.


Operation

MEMORY STORAGE & RECALL

The FT-23R MKⅡ offers ten programmable memory channels, numbered [0] through [9].To store a frequency in memory:r Select the desired frequency in the Dial mode as described above,r Press [F] + [M] (the Memory number will blink) and select the desired Memory num-

ber for storage using the DIAL selector or [p] / [q] keys,r Press [D/MR] to store the Dial frequency into the selected Memory: The Memory

number should disappear, and operation will continue in the Dial mode.Once you press [F] + [M] in the above procedure, while the Memory number is blinking,you have a maximum of four seconds between DIAL selections or keystrokes until youpress [D/MR]. If you time out, a memory number will be displayed after you press [D/MR](and nothing new will have been stored in the memory). Simply start again. Remember thatwhen you store data in memory, the data previously stored in that channel (if any) erased.

Example: to store 145.00 MHz in channel [0 ]r Press [D/MR] once if a Memory number is displayed, to select the Dial mode. Then

use the DIAL selector or [p] and [q] keys to select 145.000 on the display.r Press [F] + [M] and then rotate the DIAL knob until [0] is displayed (blinking) at the

upper left corner.r Press [D/MR]. There should now be no memory number displayed. If there is, you

timed out and should start again.To recall prestored memories press [D/MR], if necessary, to select the Memory mode(Memory number is displayed), and then rotate the DIAL selector or press the [p] and [q]keys, which select the memories when in the Memory mode (as opposed to frequencyselection in the Dial mode). Only prestored memories are displayed: empty memories areskipped.

To exit the Memories and return to Dial mode, press [D/MR].

Call Channel Memory [0]Memory [0] is special “Call Channel Memory”, which can be instantly recalledfrom any mode just pressing the [] key. Press [D/MR] when finished to return tothe previously selected mode.


Operation

REPEATER OPERATION

Tune to the repeater’s output frequency, and then press the [RPT] key: once for “+” shift(to transmit 600 kHz above your receive frequency), and again for “–” shift (to transmit600 kHz below your receive frequency). Pressing [RPT] again will return to simplex. A“+” or “–” is displayed at the upper right corner when standard repeater shift is selected,and when the PTT switch is pressed to transmit, the displayed frequency will shift 600 kHzup or down, if in band. If the resulting transmit frequency is outside of the ham band, “Err ”is displayed instead.

You can check the frequency to be used for transmission without pressing the PTT switch:just press [REV] to reverse transmit and receive frequencies. If two beeps sound and thefrequency does not change, the repeater shift is out-of-band. If both frequencies are inband, the shifted frequency will be displayed, and the “+” or “–” at the upper right willblink, signifying that the transmit and receive frequencies are reversed. Using this reversefunction allows you to check the repeater input frequency to see if you can work a particu-lar station direct (on a simplex frequency, of course). Press [REV] again to return to theoriginal repeater shift.

Once standard repeater shift is activated in the Dial mode, it can be stored in any memoryalong with the frequency (as described in the preceding section). Then whenever that memoryis recalled, the stored shift will be active (the “+” or “–” will be displayed). The reversefunction cannot be stored in memory, although both [RPT] and [REV] can be pressed totemporarily change repeater operation on a memory that includes repeater shift, the newsetting will not be stored. Repeater functions can also be activated temporarily on simplexmemories, if required.

Non-Standard Repeater SplitsMemories 0 through 6 can also store an independent transmit frequency, for operation onrepeaters with non-standard shift. To do this, first store the receive frequency as describedin Memory Storage & Recall. Then retune the Dial to the desired transmit frequency, andrepeat the storage procedure, but this time hold the PTT switch at the last step (when youpress [D/MR] the last time while the memory number is blinking). Now when you recallthe memory, “–+” will be displayed together at the upper right. The [RPT] key will bedisabled while operating on the odd-split memory, but the [REV] key will still function asdescribed above.


Operation

SCANNING

Before starting the scanner, make sure the SQL control is set to squelch off the noise on aclear channel. As with frequency selection, two different modes of scanning are available:band scanning or memory scanning. In both modes, scanning is manually activated anddeactivated by the [p] or [q] key. Just press and hold the key for more than ½-second tostart the scanner. If the transceiver is in the Dial mode, band scanning will result. If amemory number is displayed, the transceiver is in the Memory mode, and only prestoredmemories will be scanned.

The scanner pause on any channel where a signal is found strong enough to open thesquelch, and resumes about two seconds after the channel becomes clear. To stop the scan-ner, press any one of [p], [q], [D/MR] keys or the PTT switch.

For memory scanning, it is sometimes useful to be able to scan only certain memories. Touse this feature, you can “hide” any memory from the scanner (except Memory [0]) with-out erasing it altogether. To hide a memory, press [F] + [D/MR], select the memory to hide,and press [F] + [D/MR] again while the Memory number is blinking. The display reverts tomemory [0], and the hidden memory can no longer be selected or scanned.

To unmask a hidden memory, just repeat the same steps you took to hide it: press [F] + [D/MR], select the Memory number to unmask, and press [F] + [D/MR] again.


Operation

PRIORITY CHANNEL MONITORING

The Priority function allows periodic checking for activity on a “priority channel” whileoperating on another frequency in the Dial mode, or other memories. When the receiversenses a signal on this priority channel, operation will automatically shift to that frequency,for as long as a carrier is received. If you transmit while the squelch is open on the prioritychannel, priority monitoring is cancelled and operation stays on the priority channel.

The squelch must first be set the receiver is silent on a clear channel, and the prioritychannel frequency must be stored in a memory (this must be Memory [1] if you plan tooperate on other memories while priority monitoring). Press [D/MR], if necessary, to se-lect the desired Dial or Memory mode, and tune to the frequency or select the memory youwant to operate on while priority monitoring. Press [F] + [PRI] to activate priority channelmonitoring. A “P” will appear in the memory window at the upper left corner of the dis-play, and about every five seconds the displayed frequency will shift to priority channelbriefly while the receiver checks for a signal.

As long as no signal appears on the priority channel to open the squelch, you can tune,transmit and receive on the Dial, or select and operate on other memories (although thememory number is not displayed). If a station you wish to talk with appears on the prioritychannel, press the PTT switch momentarily while receiving his signal, to stop prioritymonitoring on that frequency.

Otherwise, to cancel priority monitoring, press [D/MR].


Operation

TONE SQUELCH OPERATION

The FT-23R MKⅡ can be used to silently monitor for calls on busy channels when theoptional FTS-12 Tone Squelch Unit is installed. A general description and installationinstructions are on Page 22.

To check and optionally set the tone frequency, press [F] + [T SET]. The tone frequencywill be displayed (in Hz), with a leading zero if that tone selection is a high-Q type. Tochange the selected tone frequency, rotate the DIAL selector or press [p] or [q] until thedisplay shows the tone frequency you require (the display will step through the standardEIA tones, listed in the table below). Press [T] to return to the operating frequency displaywhen the tone frequency is selected.

To activate the tone squelch functions press the [T] key. With one press, “ENC” (encode)will be displayed and the tone generator will be activated for transmission. Press [T] againand both “ENC” and “DEC” (decode) will be displayed together as the tone squelchsystem is activated for both transmission and reception (only signals sending the matchingtone frequency will open the squelch). Pressing [T] once more disables tone squelch fea-tures.

Once you have the tone squelch set up the way you want it, you can store it in memory (orthe call channel) by pressing [F] + [M], select the memory to store, and [M] again. After-wards, to change a setting stored in memory, just recall the memory, reset the tone fre-quency or function, and press [F] + [M] and then [M] alone.

FTS-12 Tone Frequencies (Hz)

67.071.974.477.079.782.585.488.591.594.8

100.0103.5107.2110.9114.8118.8123.0127.3131.8136.5

141.3146.2151.4156.7162.2167.9173.8179.9186.2192.8

203.5210.7218.1225.7233.6241.8250.3


In Case of ProblemsFT-23R MKⅡ operation is not complicated, but it is still possible to get lost, at least untilyou have had the chance to learn the various functions of the keypad and display. If thedisplay shows nothing at all, check the power switch (VOL control), and if necessary,remove the battery pack and check that the contacts are clean. If all appears to be physi-cally in order, recharge or replace the batteries.

Fortunately, the display itself includes enough symbols and function indicators to let youknow what is going on as long as power is applied, so it is well worthwhile to study thedisplay diagram on page 5 carefully. For example, if the frequency display changes unex-pectedly when you transmit (or if “Err ” appears), check for a small “+” or “–” at the upperright-hand corner. Also, if only a few seemingly non-sensical digits appear, press [T] todisable the tone squelch setting feature.

Attempting an illegal command (such as activating the tone squelch when the FTS-12 isnot installed), will cause two beeps to sound. If pressing a key appears to do nothing, firstcheck for a small “L” at the lower left, which indicates if the keypad is locked. If you seethis, press [F] + [LOCK] to unlock the keys. If the “L” is not there, press [D/MR], whichwill terminate any partially entered commands. If you still cannot enter data, check theBUSY/TX indicator to see if it is red, indicating that the transceiver is transmitting. Re-leasing the PTT switch should return the set to receive. If still nothing happens, switch thetransceiver off, and then back on.

To avoid confusion resulting from inadvertent key presses, set the keypad lock on (press[F] + [LOCK]) if you set the transceiver down while it is on, and then remember to set thelock back off when you wish to enter data.

If none of these measures helps, contact your Yaesu Dealer for assistance.


How long the batteries last between charges or replacement depends largely on your oper-ating habits, and how you care for the battery pack (if using a Ni-Cd pack).

The FT-23R MKⅡoffers a variety of ways to conserve battery power, and thus to extend thelife of each charge. Knowing how to use these features can be critical in emergencies.

Obviously, turning the set off when not in use saves battery life, and can also preventdamage that might result to the batteries if they are over-discharged.

Keeping the receiver squelched automatically activates the power saver function, requir-ing only about 15% of the power needed when listening to a signal or noise. So whenlistening for a call, choose a quiet frequency and close the squelch on background noise.The FTS-12 Tone Squelch option is useful for creating your own quiet channel if theentire band is crowded. Also, use the lowest possible volume setting when listening tosignals. In noisy environments, use an earphone so you can keep the volume low.

Keeping the LOW power switch on the top panel depressed requires about 60% less cur-rent when transmitting, so it is a good idea to develop the habit of always keeping thisswitch depressed, switching to high power only if low power fails to get through. If youlive in a location where high power is almost always needed, consider replacing the an-tenna with a higher gain type instead of opting for high power (the result on transmissionsis the same). Make sure that any external antenna is designed for 50-ohms impedance atthe operating frequency.

As the battery discharges, the voltage drop when transmitting will increase. When batteryvoltage drops to around 6.5V, the beeper will begin to sound continuously, indicating thatthe batteries should be replaced or recharged as soon as possible.

If using rechargeable batteries, do not keep operating once the beeper has come on, as thiscould cause over-discharge of the cells and destroy the pack. However, recharging Ni-Cdbatteries often, with little use in between charges, can also shorten the useful life of thecells. Therefore the best way to get the most out of your Ni-Cds is to use the battery packjust until the beeper comes on, and then immediately give the pack a full recharge. Unfor-tunately this is not always convenient, since it can be hard to tell exactly when the chargewill run out. One solution to this problem is to carry an extra, fully charged pack with youif you do not wish to have operation interrupted.

Getting the Most from Your Batteries


A special function of the FT-23R MKⅡ allows memories stored in one transceiver to betransferred to another set without re-entering data from the keypad. This function requiresa user-constructed cable to connect the EAR jack on the source transceiver to the MIC jackon the transceiver to be programmed, and the Clone switch inside the rubber PTT switchcover to be set to ON, as shown below.

Cloning Procedurer Turn the power switch off, and carefully pry out the rubber cover over the PTT switch.

Locate the Clone miniature slide switch in thelower part of the opening, and set this switch toits alternate position. Repeat with the other trans-ceiver.

r Connect the EAR jack of the source transceiverto the MIC jack of the target transceiver using a2-conductor shielded cable.

Memory Cloning

r Turn on the transceivers. All display digits should be blinking.r Press the [q] key on the target transceiver . The display should stop blinking and

remain either on or off (either is acceptable).r Press the [p] key on the source transceiver. The data from Memory [0] in the source

transceiver should now appear on the display of the target transceiver, as all othermemory data is being transferred (If not, check your cable).

r If “Err” is displayed on the target transceiver, switch the power off and on, and repeatthe last two steps.

r After the data has been transferred (a few seconds), turn the radio off, reset the Cloneswitches to their original position, and replace the rubber covers.


Installation of Option

FTS-12 TONE SQUELCH UNIT INSTALLATION

The FTS-12 is a subaudible CTCSS (Continuous Tone-Controlled Squelch System) whichoffers programmable selection of 37 tones for transmission and filter/detectors for recep-tion. Transmit-only (encode) and transmit/receive (encode/decode) modes are selectablefrom keys on the transceiver. Installation is descrived here, while Tone Squelch operationis described on page 17.

Make sure the transceiver is off. Remove the hard or soft case, if used, and remove thebattery pack as described on page 9.

1. Remove the four screws affixing the battery spring plate on the bottom of the trans-ceiver and carefully remove the plate.

2. Locate and remove the small “Dummy Unit” circuit board connected to the 10-pinconnector in the compartment on the bottom of the transceiver. It is not needed whenthe FTS-12 is installed.Note: If the FTS-12 is later removed, the Dummy Unit must be replaced in the 10-pinconnector to allow normal operation.

3. Connect the plug in the transceiver to the FTS-12.4. Locate the double-sided adhesive tape that is already installed inside the compartment

on the bottom of the transceiver, and remove the paper cover from the tape. Thenmount the FTS-12 by pressing the flat surface of the IC (on the FTS-12) against thetape (see below).

5. Apply the (supplied) insulating adhesive tape to the battery spring plate.6. Replace the battery spring plate and its four screws, and the battery pack.


Note


Note

This device complies with Part 15 of the FCC rules.Operation is subject to the condition that this devicedoes not cause harmful interference.

Printed in Japan

9904g-0K

Copyright 1999Yaesu Musen Co., Ltd.All rights reserved.

No portion of this manualmay be reproducedwithout the permission ofYaesu Musen Co., Ltd.

E 2 9 0 0 1 5 0 0

Yaesu Ft 23r Mk2 Op Manual

Documents

2m amateur

battery spring

standard repeater

liquid crystal

cell battery

battery case

upper left

front panel